Graphical integration of \(\sin^2(x)\) and \(\cos^2(x)\)

Visualisation; beats using double angle formulas!

Here's a nice way of visualising the integration of \(\sin^2(x)\) and \(\cos^2(x)\)
between \(\pi\) and \(2\pi\). Below the graphic is the algebraic version, which involves the
use of double angle formulas. I don't like to condone "tricks" over understanding, but this
is quite a nice demonstration I saw not long ago for speed of remembering!